Two major reason only

1 .cost - for cost cutting features we are not choosing bldc.

2. Limited constant power range: even if we compensate with cost, power range is not good for higher power equipment.

For general ev design we focus only on compact low size motor like axial type motor is preferred 2) battery capacity which deliver more Ah for longer killometerer in one charge ..

It might be noted that a BLDC is basically a PMSM just designed for trapezoidal back-emf which can be nicely used for low-cost, position-sensorless control, e.g., using hall effect sensors for generating switching pulses. In this regard, the difference between BLDC and PMSM is only minor and given the same amount of design effort their power and torque density can be pushed to nearly the same level. Against this background, the terminology ‘brushless DC motor’ is also largely incorrect from my personal perspective, since its current, voltage and flux waveforms are everything but DC – it is just a special three-phase AC motor variant.

However, another main difference is typically on the control and sensor level. Automotive PMSM drives typically incorporates positions and current sensors together with sophisticated control and functional safety to ensure proper drive function. These features are typically not part of a BLDC drive, however, there is not technical issue to integrate them.